who here can explain transistors? i'm very amateur at this electronics thing, but i can pick it up decently quickly. i've known about resistors and how to use them forever, i've started using capacitors, and now i need to learn how to use a transistor. what's the diff between a bipolar, (JETT or FETT?), MOSFET, NPN, PNP? i'm trying to design a simple circuit that would make a led fade for a period of 4-5 seconds. Right now i'm using 30,000uF large capacitors(3x10,000uF). I was told that i can use a really tiny capacitor and a transistor. the circuit uses 3 volts, and i need to power 4 LEDS. leds are 3 volts each at 20mA each. Any help would be aweseome Thanks.